Experimental Investigation on Dynamic Fracture Mechanism and Energy Evolution of Saturated Yellow Sandstone under Different Freeze-Thaw Temperatures

Table 3

Dynamic elastic modulus (E_d), peak strength (), and peak strain () under different freezing temperatures ( is the peak stress of dynamic stress-strain curve; is the strain corresponding to the peak stress; and E_d is the slope of the stress-strain curve in elastic stage).

Specimen	T (°С)	Ed (GPa)		(MPa)
		Sample	Average	Sample	Average	Sample	Average
1	20	36.71	38.29	72.06	74.02	0.0062	0.0064
2		38.42		73.94		0.0068
3		39.73		76.05		0.0063
4	−5	37.21	34.00	67.73	70.49	0.0072	0.0075
5		30.79		72.88		0.0075
6		35.82		70.86		0.0079
7	−10	28.74	27.57	62.10	61.97	0.0087	0.0091
8		29.78		57.38		0.0101
9		24.19		66.52		0.0085
10	−15	17.13	19.07	53.78	53.74	0.0089	0.0093
11		20.37		57.55		0.0086
12		19.72		49.90		0.0104
13	−20	12.67	12.43	45.58	46.44	0.0108	0.0104
14		13.04		45.26		0.0110
15		11.58		48.49		0.0093
16	−30	6.85	6.62	36.35	37.51	0.0147	0.0142
17		6.52		37.12		0.0136
18		6.49		39.07		0.0142